Industrial Advantage And Disadvantage Of Dc Motor

The majority of movement of materials and goods across continents is through container ships, however, in some cases, planes are used to transport goods. Trucks and trains move materials and goods and within a country or a continent. In some cases, ships sail in rivers, as is the case in parts of Canada. The shares of freight transport as the percentage of the total tone-km by road, inland waterways, and railways in the EU are 75.9%, 6.7%, and 18.4% respectively (EUROSTAT, 2016). In the USA, trucks are the most used means of transportation for moving freight up to 750 miles. Trains move items in bulk beyond the 750-mile limit up to 2000 miles (United States Department of Transportation, 2015).

Using Field Oriented Control, current control is largely unaffected by speed of rotation of the motor[6].In the scheme of filed oriented control motor currents and voltages obtained from the motor are transformed into d-q reference frame. Measured currents from three stator phases these currents which are now in the stator reference frame are converted into two phase using Clarke transformations which are further converted into the corresponding rotor reference frame using Park transformation. The resultant current obtained is dc which is easier for the PI controllers to operate.

Abstract— The three-phase squirrel cage induction motor is the most widely used motor type in the industry because of its good self-starting capability, simple and rugged structure, low cost and reliability. In spite of this popularity, the induction motor has two basic limitations: (i) The standard motor is not a true constant-speed machine, its full-load slip varies from less than 1% (in high-horsepower motors) to more than 5% (in fractional-horsepower motors), and (ii) It is not inherently capable of providing variable-speed operation. The limitations of induction motor can be solved through the use of adjustable speed control method of induction machine. In this paper, various method of speed control of induction motor drive are presented.

There are various businesses that can exploit PC numerical control machine hardware, now and then known as CNC machining. The hardware is utilized to manufacture littler pieces, and in addition to make bigger pieces that are to a great degree exact. The gear that is utilized with CNC machining removes at the undesirable material of the bigger piece keeping in mind the end goal to create a littler part. It is a procedure that advantages both the producer and the end-client. What are a portion of the particular advantages of custom CNC machining?

In addition, the ratio of torque delivered to the size of the motor is higher,

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A system which is used for the mechanical handling of the material in industries is known as conveyer system.

Non Conventional energy resources like wind, biomass, tidal /wave and small hydro potential were used due to fast depletion of fossil fuels. A micro-hydro system using natural hydro potential with minimal civil works is a strong candidate in this race. However, the system must be economical, rugged, and user friendly since local communities are often not techno-savvy. Uncontrolled low head turbines are prescribed for such applications [1]-[5], which maintain almost constant input power due to fixed head and discharge. In remote locations, harnessing of electrical energy from such local resources can be cheaper and easier compared to grid connection, which involves long transmission lines and associated

The internаl combustion engine is аn engine in which the combustion of а fuel (normаlly а fossil fuel) occurs with аn oxidizer (usuаlly аir) in а combustion chаmber. In аn internаl combustion engine the expаnsion of the high-temperаture аnd -pressure gаses produced by combustion аpplies direct force to some component of the engine, such аs pistons, turbine blаdes, or а nozzle. This force moves the component over а distаnce, generаting useful mechаnicаl energy

With the rapid development in technology over the past few years it is understandable that many new manufacturing techniques have arisen in order to fine tune the precision of the characteristics and finishes of products. This report will discuss some of these manufacturing techniques and their disadvantages and advantages.

In 21st century 3D printer becoming one of the most discussed and popular technology in the world. There are many advantages and disadvantages of 3D printer are discussing on TV, in internet and in other well known magazines. Thus, positive and negative sides of 3D printing are one of the significant issues for today’s time. 3D printing technology is quickly advancing and is soon expected to become one of the basic leading technologies in society. With more advancements being made every day, a lot of discoveries have been unveiled on many other applications of 3D printing that make it an extremely important technology for society. Also, the fact that the price of 3D printers is declining, has attracted a lot of attention across the world to this revolutionary technology (Wellington).

A dc Brushless Motor uses a permanent magnet external rotor, three phases of driving coils, one or more Hall Effect devices to sense the position of the rotor, and the associated drive electronics. The coils are activated, one phase after the other, by the drive electronics as cued by the signals from the Hall effect sensors, they act as three phase synchronous motors containing their own variable frequency drive electronics. A simplified current controlled modulation technique for BLDC motors is presented.

The control unit causes the processor to step through a series of micro-operations in the proper sequence, based on the program being executed.

is the rotor resistor value and when the slip stays a very small value, then the s is also very small so it can be treat as a 0 value. is rotor induced EMF and it is in direct proportion to the voltage. Torque is in direct proportion to the s. Therefore, we know that torque T is also in direct proportion to . When we increase(decrease)the voltage supply, the torque will increase(decrease), therefore the speed increase(decrease). By changing the voltage supply we can achieve the speed control, this is the simplest way to control the speed. But not widely use in the real industry. Because: change a very large voltage but the speed only changes a little, the speed control range is too small. When the supply voltage has a sudden changing, the flux density in the motor, a sudden changing flus density will result a change in magnetic conditions of the motor. This result is not welcomed in the real condition of use. So changing the supply voltage is rarely used.[5][6]

Dc Motors were once the only devices known to convert electrical energy to mechanical energy or vice versa. Although they were inherited successfully by ac motors and vector control drives; they still show promising advantages like reliability, cost effectiveness, and moreover operator friendliness.